Unfortunately there is no functionality within the Synology OS which clears old backups automatically or overwrites them. This means that maybe after a few backups your USB disk
It is a common bug for MS Exchange users to keep being requested for their password. To resolve: Open credential manager on the computer by clicking on start
If you use POP or IMAP mailboxes and have just upgraded to Windows 10, you may find that you are unable to send email via Outlook any more.